scholarly journals Effects of a single initial and delayed release implant on arrival compared with a non-coated initial implant and a non-coated terminal implant in heifers fed across various days on feed

2019 ◽  
Vol 3 (4) ◽  
pp. 1182-1193 ◽  
Author(s):  
Zachary K Smith ◽  
Ben P Holland ◽  
Alyssa B Word ◽  
Grant I Crawford ◽  
Wade N Nichols ◽  
...  
Keyword(s):  
Growth Performance ◽  
Animal Health ◽  
Feed Ratio ◽  
United States Department ◽  
Initial Body Weight ◽  
Department Of Agriculture ◽  
Live Animal ◽  
Trenbolone Acetate ◽  
The Mean ◽  
Estradiol 17Β

Abstract Two experiments evaluated the effect of implant number, type, and total steroidal dose on live animal performance and carcass traits in heifers fed for three different days on feed (DOF). In experiment 1, heifers (n = 3,780; 70 heifers/pen and 9 pens/treatment; initial body weight [BW] = 309 kg) were used in a 2 × 3 factorial arrangement of treatments. Factors were as follows: 1) implant (all from Merck Animal Health, De Soto, KS): 200 mg trenbolone acetate (TBA) and 20 mg estradiol-17β (E2) administered on arrival (SINGLE), or 80 mg TBA and 8 mg E2 administered on arrival followed by 200 mg TBA and 20 mg E2 after approximately 90 d (REPEATED) and 2) duration of DOF: harvested after approximately 172, 193, and 214. In experiment 2, heifers (n = 3,719; 65 to 70 heifers/pen and 9 pens/treatment; initial BW = 337 kg) were used with the same factors as experiment 1, except DOF were 150, 171, and 192. No implant × DOF interaction (P ≥ 0.06) was noted for any performance parameters in either experiment. Heifers administered REPEATED had improved (P ≤ 0.05) live gain to feed ratio (G:F) and carcass-adjusted G:F and tended (P = 0.09) to have greater hot carcass weight (HCW) in experiment 1. Increasing DOF resulted in greater (P ≤ 0.01) live and carcass-adjusted final BW and decreased (P = 0.01) live ADG in experiment 1. As DOF increased, HCW, HCW gain, and dressing% (P ≤ 0.01) increased in experiment 1. The mean carcass transfer was 79.6% across the 42 d terminal window in experiment 1. In experiment 2, REPEATED had improved (P = 0.03) carcass-adjusted G:F compared with SINGLE, but HCW was not different (P = 0.36) between treatments. Increased DOF resulted in greater (P ≤ 0.01) final live and carcass-adjusted BW, decreased (P ≤ 0.01) live and carcass-adjusted ADG, and poorer (P ≤ 0.01) live and carcass-adjusted G:F in experiment 2. In experiment 2, dressing percentage was greater (P = 0.02) in REPEATED compared with SINGLE. Heifers given SINGLE had greater (P = 0.01) back fat and estimated empty body fat (EBF), whereas REPEATED had fewer (P = 0.01) Yield Grade 4 carcasses and greater (P = 0.01) longissimus muscle (LM) area. Increased DOF resulted in greater (P ≤ 0.04) HCW, HCW gain, dressing%, back fat, LM area, marbling, EBF%, and United States Department of Agriculture (USDA) Prime-grading carcasses, Yield Grade 4 and 5, and over 454-kg carcasses in experiment 2. Carcass ADG and carcass transfer indicate a 0.70 kg carcass ADG between 150 and 192 DOF, resulting in an average carcass transfer of 72.2% in experiment 2. Although feedlot growth performance and HCW did not differ between the implant regimens tested, increasing DOF resulted in decreased live growth performance while increasing the proportion of USDA prime carcasses and HCW.

scholarly journals Effects of coated and noncoated steroidal implants on growth performance, carcass characteristics, and serum estradiol-17β concentrations of finishing Holstein steers

2020 ◽  
Vol 4 (4) ◽  
Author(s):  
Pedro H V Carvalho ◽  
Mariana F Westphalen ◽  
Jonathan A Campbell ◽  
Tara L Felix
Keyword(s):  
Growth Performance ◽  
Animal Health ◽  
Average Daily Gain ◽  
Carcass Characteristics ◽  
Feed Ratio ◽  
Serum Estradiol ◽  
Trenbolone Acetate ◽  
Coated Implant ◽  
Daily Gain ◽  
Estradiol 17Β

Abstract The objectives of the study were to determine the effect of coated or noncoated hormone implants on growth performance, carcass characteristics, and serum estradiol-17β (E2) concentrations of Holstein steers fed a grain-based diet for 112 d. Seventy-nine Holstein steers [average initial body weight (BW) = 452 ± 5.5 kg] were stratified by BW and allotted to one of two treatments: 1) Holstein steers implanted with a coated implant containing 200 mg of trenbolone acetate (TBA) and 40 mg E2 (Revalor-XS (Merck Animal Health; Summit, NJ)] on day 0 (XS) or 2) Holstein steers implanted two times (days 0 and 56) with a noncoated implant containing 80 mg of TBA and 16 mg of E2 [(2IS) Revalor-IS (Merck Animal Health)]. Data were analyzed using the MIXED procedure of SAS (SAS Inst. Inc., Cary, NC). There was no effect (P ≥ 0.71) of implant strategy on initial, middle, and final BW. No effect (P ≥ 0.12) of implant strategy was observed on average daily gain, dry matter intake, or gain-to-feed ratio. There were no effects (P ≥ 0.11) of implant strategy on carcass characteristics. There was an implant × day interaction (P < 0.01) for the circulation of serum E2 concentrations. Serum E2 concentration increased similarly 14 d after Holstein steers were implanted, regardless of implant strategy. At 28 d, after steers were implanted, steers in the XS group had less serum E2 concentration than Holstein steers in the 2IS group. However, at 56 d after the first implantation, both groups, once again, had similar serum E2 concentrations and E2 concentrations were less on day 56 than day 28 for both strategies. Holstein steers implanted with 2IS had greater serum E2 concentration on day 70 and E2 concentrations remained greater than serum E2 of Holstein steers implanted XS for the duration of the trial (day 112). In summary, there was no effect of coated or two doses of noncoated implant on growth performance or carcass characteristics of Holstein steers.

scholarly journals Effects of steroidal implants on feedlot performance, carcass characteristics, and serum and meat estradiol-17β concentrations of Holstein steers

2019 ◽  
Vol 4 (1) ◽  
pp. 206-213 ◽  
Author(s):  
Pedro Henrique Vilela Carvalho ◽  
George A Perry ◽  
Tara L Felix
Keyword(s):  
Feed Efficiency ◽  
Animal Health ◽  
Average Daily Gain ◽  
Carcass Characteristics ◽  
Feed Ratio ◽  
Longissimus Muscle ◽  
Feedlot Performance ◽  
Trenbolone Acetate ◽  
Daily Gain ◽  
Estradiol 17Β

Abstract The objectives of the study were to determine the effect of steroidal implants on growth performance, carcass characteristics, and estradiol-17β (E2) concentrations in the blood and longissimus muscle of Holstein steers fed a grain-based diet. Seventy Holstein steers (average initial BW = 275 ± 6.4 kg, 10 to 12 mo of age) were assigned to treatments: (i) implanted with 80 mg of trenbolone acetate (TBA) and 16 mg of E2 (Component TE-IS with Tylan; Elanco Animal Health, Greenfield, IN) at the start of the trial (day 0), and reimplanted with 120 mg of TBA and 24 mg of E2 (Component TE-S with Tylan; Elanco Animal Health) on day 84 of the experiment; or (ii) no implant. Implanted Holstein steers were heavier (P ≤ 0.01) than nonimplanted Holstein steers in the middle (day 84) and at the end of the experiment (day 186). Implanting Holstein steers increased (P < 0.01) average daily gain (ADG) and dry matter intake (DMI) without affecting gain-to-feed ratio compared with nonimplanted animals. Carcasses from implanted Holstein steers had greater (P < 0.01) hot carcass weight (HCW) and longissimus muscle (LM) area than carcasses from nonimplanted steers. Implanting did not affect (P ≥ 0.21) other carcass characteristics. There was an increase (P = 0.03) of 1.3 pg of E2/g of muscle in implanted Holstein steers compared with that from nonimplanted Holstein steers. There was an implant × day interaction (P < 0.01) in serum E2 concentrations. Serum E2 concentrations were not altered in nonimplanted Holstein steers, whereas E2 concentration increased (P < 0.01) after steers were implanted, regardless of implant characteristics. Serum E2 peaked at 28 days after the first implant and then rapidly declined after day 56. In summary, steroidal implants administered on days 0 and 84 increased DMI, ADG, HCW, and LM area in Holstein steers compared with nonimplanted steers due to increased serum E2 concentrations. However, these changes did not improve feed efficiency or other carcass characteristics.

scholarly journals 43 Effects of steroidal implants on feedlot growth performance, carcass characteristics, and serum and meat estradiol-17β concentrations of Holstein steers

2020 ◽  
Vol 98 (Supplement_3) ◽  
pp. 33-34
Author(s):  
Pedro Carvalho ◽  
Tara Felix ◽  
George Perry
Keyword(s):  
Growth Performance ◽  
Dry Matter ◽  
Animal Health ◽  
Average Daily Gain ◽  
Carcass Characteristics ◽  
Dry Matter Intake ◽  
Feed Ratio ◽  
Longissimus Muscle ◽  
Daily Gain ◽  
Estradiol 17Β

Abstract Objectives were to determine the effects of implants on growth performance, carcass characteristics, and estradiol-17β (E2) concentrations in the serum and longissimus muscle of Holstein steers fed a grain-based diet. Seventy Holstein steers (initial BW = 275 ± 6.4 kg) were assigned to treatments: (1) Implanted on d 0 with Component TE-IS with Tylan (Elanco Animal Health, Greenfield, IN) and on d 84 with Component TE-S with Tylan (Elanco Animal Health) of the experiment; or (2) not implanted (control). Implanted Holstein steers were heavier (P ≤ 0.01) than nonimplanted Holstein steers on d 84, at time of reimplant, and at the end of the experiment (d 186). Implanting Holstein steers increased (P < 0.01) average daily gain (ADG) and dry matter intake (DMI) without affecting (P = 31) gain-to-feed ratio (G:F) when compared to steers that were not implanted. Carcasses from implanted Holstein steers had greater (P < 0.01) hot carcass weights (HCW) and longissimus muscle (LM) area than carcasses from nonimplanted steers. Implanting did not affect (P ≥ 0.21) other carcass characteristics. There was an increase (P = 0.03) of 1.3 pg of E2/g of muscle when LM from implanted Holstein steers was compared to LM from nonimplanted steers. There was an implant × day interaction (P < 0.01) in circulating serum E2 concentrations. Serum E2 concentrations remained relatively constant in nonimplanted Holstein steers. In implanted steers, serum E2 concentrations increased (P < 0.01) after each implant. Serum E2 peaked at 28 d after the first implant and then declined after d 56. Implanting Holstein steers fed grain-based diets increased ADG, HCW, and LM area due to increased circulating E2 concentrations. Implants did increase LM E2 concentrations; however, changes were minimal compared to E2 concentrations in other human foods and were not great enough to warrant concerns regarding meat consumption from implanted animals.

Estimated Economic Losses Associated with the Destruction of Plants Due to Phytophthora ramorum Quarantine Efforts in Washington State

2007 ◽  
Vol 8 (1) ◽  
pp. 20 ◽  
Author(s):  
Norman L. Dart ◽  
Gary A. Chastagner
Keyword(s):  
United States ◽  
The United States ◽  
Washington State ◽  
Phytophthora Ramorum ◽  
Economic Losses ◽  
United States Department ◽  
Department Of Agriculture ◽  
States Department ◽  
The Mean ◽  
Inspection Service

The number and retail value of plants destroyed in Washington State nurseries due to Phytophthora ramorum quarantine efforts was estimated using Emergency Action Notification forms (EANs) issued by the United States Department of Agriculture Animal and Plant Health Inspection Service between 2004 and 2005. Data collected from EANs indicate that during this period 17,266 containerized nursery plants were destroyed at 32 nurseries, worth an estimated $423,043. The mean loss per nursery was estimated at $11,188 in 2004, $11,798 in 2005, and at $13,220 per nursery over the 2-year period. Accepted for publication 26 January 2007. Published 8 May 2007.

The United States Department of Agriculture, 1900–1945

2019 ◽  
Author(s):  
Anne Effland
Keyword(s):  
World War I ◽  
Animal Health ◽  
The United States ◽  
Agricultural Science ◽  
Federal State ◽  
United States Department ◽  
Regulatory State ◽  
World War ◽  
Department Of Agriculture ◽  
The Law

President Abraham Lincoln signed the law that established the Department of Agriculture in 1862 and in 1889, President Grover Cleveland signed the law that raised the Department to Cabinet status. Thus, by 1900 the US Department of Agriculture had been established for nearly four decades, had been a Cabinet-level department for one, and was recognized as a rising star among agricultural science institutions. Over the first half of the next century, the USDA would grow beyond its scientific research roots to assume a role in supporting rural and farm life more broadly, with a presence that reached across the nation. The Department acquired regulatory responsibilities in plant and animal health and food safety and quality, added research in farm management and agricultural economics, provided extension services to reach farms and rural communities in all regions, and created conservation and forestry programs to protect natural resources and prevent soil erosion and flooding across the geographical diversity of rural America. The Department gained additional responsibility for delivering credit, price supports, supply management, and rural rehabilitation programs during the severe economic depression that disrupted the agricultural economy and rural life from 1920 to 1940, while building efficient systems for encouraging production and facilitating distribution of food during the crises of World War I and World War II that bounded those decades. In the process, the Department became a pioneer in developing the regulatory state as well as in piloting programs and bureaucratic systems that empowered cooperative leadership at the federal, state, and local levels and democratic participation in implementing programs in local communities.

scholarly journals International perspective: characterisation of United States Department of Agriculture and Meat Standards Australia systems for assessing beef quality

2008 ◽  
Vol 48 (11) ◽  
pp. 1465 ◽  
Author(s):  
G. C. Smith ◽  
J. D. Tatum ◽  
K. E. Belk
Keyword(s):  
United States ◽  
Quality Assessment ◽  
Carcass Trait ◽  
Grading System ◽  
United States Department ◽  
Beef Quality ◽  
Department Of Agriculture ◽  
Live Animal ◽  
States Department ◽  
Quality Grading

The intent, in this manuscript, is to characterise the United States Department of Agriculture (USDA) and Meat Standards Australia (MSA) systems for assessing beef quality and to describe the research evidence that supports the principles involved in grade application. USDA beef quality grading standards rely on carcass-trait-only assessments of approximate age of the animal at harvest and amount of intramuscular fat (as marbling) inside the muscles. USDA beef quality grading started 82 years ago. Then, as now, because no traceability system was in place, each animal’s history (exact age, feeding regimen, management practices, etc.) was incomplete; those who assigned quality grades used indicators of age (physiological maturity) and plane of nutrition (amount of marbling), and they do so still. Since 1926, research studies have identified a multitude of palatability-determining live-animal factors (e.g. genetics, use of hormonal growth promotants, high-energy diet finishing) and carcass-treatment factors (e.g. electrical stimulation, tenderstretch carcass suspension, postmortem aging) that cannot be incorporated into a carcass-trait-only quality assessment system. The USA beef industry has depended on development of more than 100 beef brands – some using palatability assurance critical control point plans, total quality management (TQM) philosophies, USDA certification and process verification programs, or combinations of live-animal factors, carcass-treatment factors and carcass-trait constraints – to further differentiate fresh beef products. The MSA grading system is a TQM grading approach that incorporates animal-specific traits (e.g. genetics, sex, age), control of certain pre-harvest and post-harvest processes in the beef chain, cut-specific quality differences and consumer preferences, into a beef pricing system. A unique aspect of the MSA grading system is that the grades are assigned to cuts or muscles, not carcasses; cuts or muscles from the same carcass are assigned individual (and in many cases, different) grades that reflect differences in expected eating quality performance among the various cuts of beef further adjusted to reflect the influence of cut or muscle aging and alternative cooking methods. The MSA grading system is still being modified and refined (using results of an extensive, ongoing consumer testing program), but it represents the best existing example of a TQM grading approach for improving beef quality and palatability. Research studies have shown that the accuracy of palatability-level prediction by use of the two systems – USDA quality grades for US customers and consumers and MSA grades for Australian customers and consumers – is sufficient to justify their continued use for beef quality assessment.

scholarly journals Effects of zinc propionate supplementation on growth performance, skeletal muscle fiber, and receptor characteristics in beef steers

2020 ◽  
Vol 98 (7) ◽  
Author(s):  
Kimberly B Wellmann ◽  
Jessica O Baggerman ◽  
W Clay Burson ◽  
Zachary K Smith ◽  
Jongkyoo Kim ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Growth Performance ◽  
Muscle Fiber ◽  
Block Design ◽  
Animal Health ◽  
Average Daily Gain ◽  
Skeletal Muscle Fiber ◽  
Feed Ratio ◽  
Fiber Types ◽  
Feeding Period

Abstract A randomized complete block design experiment with 32 yearling crossbred steers (average body weight [BW] = 442 ± 17.0 kg) fed a steam-flaked corn-based diet was used to evaluate the effects of dietary Zn (KemTRACE Zn propionate 27; Kemin Industries, Inc., Des Moines, IA) supplementation on live growth performance, skeletal muscle fiber, and beta-adrenergic receptor (β-AR) characteristics during the finishing phase. Steers were blocked by BW (n = 4 blocks; 8 steers/block), assigned to pens (n = 4 steers/pen), and randomly assigned to the following treatments: control (CON; 0.0 g/[head (hd) · d] of additional Zn) or additional dietary Zn (ZnP; 1.0 g/[hd · d] additional Zn). The basal diet contained Zn (60 ppm dry matter basis) from ZnSO4; additional Zn was top-dressed at feeding. Ractopamine hydrochloride (RH; Optaflexx: Elanco Animal Health, Greenfield, IN) was included at 300 mg/(hd · d) for the final 28 d of the 111-d feeding period. Longissimus muscle biopsy samples, BW, and blood were obtained on days 0, 42, 79, and 107. Final BW was collected prior to shipping on day 111. Biopsy samples were used for immunohistochemical (IHC), mRNA, and protein analysis. Serum urea nitrogen (SUN) and nonesterified fatty acid (NEFA) concentrations were measured. Steers fed ZnP had a greater average daily gain (P = 0.02) and gain to feed ratio (G:F; P = 0.03) during the RH feeding period compared with CON. There were no differences (P > 0.05) in other growth performance variables, carcass traits, mRNA abundance, or relative protein concentration for fiber type and β-AR. Fiber types I and IIA had no differences in the cross-sectional area; however, the IIX area was greater for CON (P < 0.04) compared with ZnP and increased (P < 0.02) over time. There were no differences between treatments for the β1-AR density (P > 0.05) in skeletal muscle tissue throughout the study. A treatment × day interaction was observed in β2-AR density (P = 0.02) and β3-AR density (P = 0.02) during the RH feeding period, where the abundance of the receptors increased with ZnP but did not change in CON. Compared with CON, ZnP had greater (P < 0.01) mean NEFA concentrations. Mean SUN concentrations did increase by day (P < 0.01). Additional dietary Zn, supplied as Zn propionate, upregulates β2-AR and β3-AR and improves growth performance in feedlot steers during the RH feeding period, likely through a shift of resource utilization from lipogenesis to muscle maintenance and hypertrophy.

scholarly journals The effect of creep feed and diet complexity on growth performance in suckling and weaned pigs

2020 ◽  
Vol 33 (3) ◽  
pp. 159-171
Author(s):  
Paige K Isensee ◽  
Sarah E ◽  
Lindsey G Wichman ◽  
Autumn L Thoma ◽  
Young D Jang
Keyword(s):  
Body Weight ◽  
Growth Performance ◽  
Average Daily Gain ◽  
Feed Ratio ◽  
Initial Body Weight ◽  
Weaned Pigs ◽  
Creep Feed ◽  
Suckling Piglets ◽  
D 12 ◽  
Dietary Treatments

Background: Creep feed is offered to suckling piglets to introduce solid feed and provide extra nutrients in late lactation. However, the effect of creep feed is inconsistent; there is little information about the effect of creep diet complexity on piglet performance. Objective: Two experiments were conducted to evaluate the effect of creep feed and its complexity on growth performance of suckling and weaned pigs. Methods: In Exp. 1, eight litters (average 19.9 ± 1.1 d of age; initial piglet weight: 6.74 ± 1.2 kg) were allotted to two dietary treatments considering breed, litter size and weight, as follows: no creep feed (n=3) and creep feed (n=5; offered for 8 days before weaning). At weaning (d 28 of age), the pigs were divided into three treatments (6 pigs/pen, 3 replicates; initial body weight: 9.66 ± 0.34 kg) balanced by gender, body weight, and breed, as follows: creep feed eaters, creep feed non-eaters, and no creep feed. In Exp. 2, two different types of creep feed were offered to suckling piglets (initial piglet weight: 3.79 ± 0.55 kg) in seven litters from d 12 of age (average 12.0 ± 1.3 d of age) to weaning (d 25 of age). Treatments were: HCF (n=4): highly-complex creep diet containing 3% fish meal, 2.4% blood meal, and 15% whey; and 2) LCF (n=3): lowly-complex creep diet without the mentioned ingredients. At weaning, only eater pigs were divided into 2 treatments (6 pigs/pen, 3 replicates; initial body weight: 7.53 ± 0.97 kg) balanced by gender, breed and body weight as follows: HCF eaters and LCF eaters. In both experiments, creep feed was mixed with 1% Cr2O3 to measure fecal color for eater/non-eater categorization and the pigs were fed a common nursery diet for 21 days. Results: In both experiments, there were no differences on piglet weaning weight and overall nursery growth performance among the treatments. In Exp. 2, the creep feed intake and percentage of eaters per litter were not different between the HCF and LCF treatments, whereas the HCF eaters tended to have a greater average daily gain (p=0.08) and gain to feed ratio (p=0.09) than the LCF eaters during d 7-14 postweaning. Conclusion: Creep feed did not affect overall piglet growth in suckling and nursery phases, but its complexity might affect pig growth in the early nursery phase.

416 DOSE TITRATION FOR SUPERSTIMULATION OF BRANGUS AND BONSMARA DONORS WITH Folltropin®-V BY A SINGLE INTRAMUSCULAR INJECTION

2010 ◽  
Vol 22 (1) ◽  
pp. 365 ◽  
Author(s):  
D. Rogan ◽  
A. Tríbulo ◽  
H. Tríbulo ◽  
R. Tríbulo ◽  
D. Carballo Guerrero ◽  
...  
Keyword(s):  
Animal Health ◽  
Crossover Design ◽  
Dose Titration ◽  
Embryo Production ◽  
Release Formulation ◽  
Single Intramuscular Injection ◽  
Effect Of Treatment ◽  
The Mean ◽  
Estradiol 17Β ◽  
Donor Cows

Two experiments were designed to evaluate the superovulatory response of Brangus and Bonsmara donor cows to different dosages of Folltropin®-V (Bioniche Animal Health Inc., Belleville, Ontario, Canada) given by a single i.m. injection or twice-daily i.m. injections. In Experiment 1, Brangus cows (n = 12) were superstimulated by 6 treatments (2 × 3 factorial) in a crossover design (i.e. all cows received the 6 treatments and all treatments were represented on each day). On Day 0, cows received 5 mg of estradiol-17β plus 50 mg of progesterone and a Cue-Mate® (Bioniche Animal Health Inc.). On Day 4, cows were superstimulated with 300, 260, or 200 mg of NIH-FSH-P1 Folltropin®-V (Bioniche Animal Health Inc.) in twice-daily decreasing doses over 4 days or diluted in a slow release formulation (SRF; Bioniche Animal Health) and given in a single i.m. injection. The single injection was prepared by diluting the Folltropin®-V lyophilized powder in 1 mL of saline followed by mixing with 9 mL of the SRF in the syringe immediately before administration. In the am and pm of Day 6, all cows received PGF2, and Cue-Mates® were removed in the pm. Cows received 12.5 mg of porcine LH (Lutropin®-V; Bioniche Animal Health Inc.) in the am of Day 8 and were inseminated 12 and 24 h later. Ova/embryos were collected on Day 15 and data were analyzed by ANOVA. There was no effect of treatment (i.e. single v. twice-daily injections; P > 0.2) nor a treatment by dosage interaction (P < 0.6) on the mean (± SEM) number of total ova/embryos or transferable embryos (13.1 ± 1.9 and 7.5 ± 1.2 v. 15.5 ± 1.7 and 7.6 ± 1.0 for single v. twice-daily injections, respectively). The total number of ova/embryos did not differ among Folltropin®-V dosages (15.0 ± 2.3, 15.7 ± 2.0, and 12.1 ± 2.5 for 300, 260, and 200 mg, respectively; P > 0.4). However, the number of transferable embryos tended (P < 0.09) to be higher in donors receiving 260 mg (9.5 ± 1.6) than 200 mg (5.2 ± 0.8), with 300 mg (7.9 ± 1.5) intermediate. In Experiment 2, Bonsmara cows (n = 16) were superstimulated by 4 treatments (2 × 2 factorial) in a crossover design similarly to Experiment 1, except that 2 dosages of Folltropin®-V (200 and 300 mg) were evaluated. There were no significant effects of dosage of Folltropin®-V (P > 0.9), treatment (P > 0.3), or interaction (P < 0.4) on embryo production. The total number of ova/embryos and transferable embryos were 11.9 ± 2.0 and 7.2 ± 1.1 v. 11.1 ± 1.1 and 7.6 ± 0.7 for single and twice-daily injections, respectively, and 11.9 ± 1.9 and 7.6 ± 1.0 v. 11.1 ± 1.3 and 7.2 ± 0.8 for 300 and 200 mg of Folltropin®-V, respectively. Superstimulation of Brangus and Bonsmara cows with a single i.m. injection of Folltropin®-V diluted in a SRF resulted in comparable embryo production to twice-daily administration of Folltropin®-V over 4 days. While 260 mg seems to be the most appropriate dosage for Brangus donors, 200 mg seems to be adequate for Bonsmara donors.

Sign in / Sign up

Export Citation Format

Share Document